Left 4 Dead 2 - 327.6 hrs on record

Left 4 Dead - 252.8 hrs on record

Borderlands - 131 hrs on record

Does that count?

Left 4 Dead 2: 151 hours played.

Dragon Age: Origins - Ultimate Edition: 120 hours played.

If its steam only then Terraria at 125 hours and tf2 at 98 hours

if its non steam, then roughly 3000 hours on oblivion and 300 on skyrim

First - TF2 with 710 hours played

Second - Garry´s Mod with 250 hours played

dota2 500 hours.

dota1 its over 9000!!!

tf2-370, assassins creed brotherhood-185, dota 2-137, l4d2-113, portal-82 (including mods), hl2-75 (including mods), portal 2-73.6, ut3-43

not so much a sudden drop but there does seem to be an exponential decline

Dungeon Defenders - 242.3 Hrs
Terraria - 109.7 Hrs

Killing Floor: 31.2 hours played
Hearts of Iron 2: 28.8 hours played

My stats are really wonky though, it says I haven't played Half-Life 2 or SiN: Emergence or a whole mess of other games I know I've beaten. Idunno, maybe when I had my old comp and was playing Steam (went without a good comp for like 6 years) they didn't record playing time.

Terraria with an avg of 62hrs, then Borderlands, followed VERY close by Dota2 and Dungeon Defenders.

After that there's not much, some single player games are pretty close to their avg playing time (8hrs).
I honestly doubt much of us would have like 10+ games with around 120+hrs spent, but i'm also sure someone can challenge that.

1st Team Fortress 2 1003.5 hrs on record
2nd The Elder Scrolls V: Skyrim 81.6 hrs on record

Dungeons of Dredmor 99.3 hours Terraria 60 hours.
i want to play TF2 but my pc have problem with source engine. it just wont launch.

1º Team Fortress 2 with 864.8 hrs on record

2º Super Street Fighter IV: Arcade Edition with 235.8 hrs on record

I've played roughly 100 hours of Terraria, TF2, and Recettear each (give or take about 20 hours), and then there's a steep drop-off after that.

Team Fortress 2 : 1319.2 hours
Fallout New Vegas : 205 hours

Team Fortress 2 was my only Steam game for quite some time. Then I got deep into the trading game, amassed a large virtual fortune, and sold it all one day for the majority of my Steam games. Gave everything I didn't sell to my friends and quit. New Vegas was my first RPG.

Minecraft might be one or two if you count it. Sunk so many hours into that building Reichstag level buildings and large towns.

Civilization 5 (290.9 hrs)
Warhammer 40k: DoW2 - Retribution (172.4 hrs)
EVE Online (171.9 hrs)
Then a drop to 85hrs with Plants vs Zombies. No more sudden drops after that, for some reason. Gradual decline from 85 to 0.01 hrs.

Civ V - 331.2

TF2 - 200.6

Killing Floor - 42.6 hrs

Dungeons of Dredmor - 27.2 hrs

Meh.

959 hours - TF2
50 hours - L4D2

Terraria : 169.7 h

Skyrim : 155.2 h

well, from games that have logged time...

15000+ hrs World of Warcraft
196ish hrs for FFX iirc.

Few other games I've played than FFX but they don't log time :<

i have tf2 182hrs, PvZ 121, and non steam games like starcraft 2 at least 250 hrs.

TF2: 2500+ hours (idle vs. pre-time-tracking hours probably balance out by now... I didn't start idling until I hit around 2000 recorded hours of actual play time)
Defense Grid: ~240 hours

Mostly, the decline after that is surprisingly smooth though.

1: TF2- 263 hours

2: Sims 3 and Skyrim tied at 89

Team Fortress 2 - 3471.8 hrs

Counter-Strike 1.6 - 1374